Extensible plank



Aug. 26, 1930. HARDlNG 1,774,268

EXTENS IBLE PLANK Attorney Aug. 26, 1930.

C. HARDING EXTENS I BLE PLANK Filed March l2. 1929 2 Sheets-Sheet 2 lasigned.- Y f y Patented' Aug. 26, `1930 i' 1 *UNiran:.fsfrwrasv oFFlcE I CHAUNCY HARDING, OF DENVERI,KVCOLORAD, 'ASSIGNOR OF- ONE-HALF TO'CEPVHAS W.

i f EAS'IMANQOF DENVER, (JOLOTL'tADOl EXTnNsrBLn rta-NK v Application filed March12, 1929. Serial No.

The present invention4 relates to Van eX- -tensible plank and has for its primeobject to provide a structure comprising av main port-ion with: a pair ofother port-ions tele- 5-scopically associated therewith.k

Another very important object of the invention re-sides inthe provision of an er@l tensible plank of this-.nature which is exceedingly simple in its construction', strong 1@ anddurable, inexpensive/to manufacture, compact and convenient in'its'arrangement of partseasy to manipulate, thoroughly eficient and reliable in use7 and otherwise wellV purpose for which it is de p v'5 and the outer ends of said bars 5 and the Yadapted to the With the above and numerous other objects inview as will appear as the .description proceeds, the invention` resides' in cer-' I tain novel features ofV construction7 andv in aothe combination and arrangement of 'parts as willY be hereinafter more rfully described.

' and claimed. f

In the drawing: Y

, Figure k1 is a perspective View of the plank 25 embodying the features .of myl invention,`

n Figure ,2 is a transverse verticalsection taken therethrough substantially on theline' 2-2 of Figure l, Y n Y Figure 3 is a horizontal section'taken subv33 stantially onthe line 3 3 .ofY Figure 2, and

' Figure L is a perspective kview of one vend' of Vthebody or intermediate' portion. AReferringr` to the drawing in detail it will Y be seen that thel letter A denotes generally a 'central' or ybody portion `having telescop ically associated therewith. end portions B. rllhe body portion Accmprises'a pair of side bars 5 disposed incoextensive spaced parallel? Y ismv and secured as at 6in the ends offchan- 40' nel bars 7 which are U-shaped 1n cross section.

A plurality of vbars 8 extend between ther Y Vchannel bars 7k in parallelism` with the bars 5 and in parallelismrwithone another. VThese vbars y8 are arranged in 'pairsand the bars l 45 of ea-ch pair are slightly spaced"k one above the other". as is Figure2. f

indicated to advantage Ain The bars 8 are secured as at V9 in the channel' vbars 7. The bight portions ofthechannel bars 7 areprovided with openings l0. Plates ll are Ysecured to the bars 5 and 8 by a suitable means l2 andV extend between the chanspacing blocks '16 'betweeny the outer` ends f thereof. kThe inner ends of these bars l5'- are slidable through opening l0 and therefore the bai-S15 slide between the bars 5 and 8.

' i The innerendsofthe bars 15 arev connected by'fplates 17* which move between thenpper and lower bars 8 as is clearly apparent from enA an inspection-of Figure 2. yThe outer bars block 16 are protect-ed by a channel guard structurev denoted byy the numeral 19. y

Fromthe above detailed description it will be seenthat the sections B may be telescoped partially into theportion A ormay be er- Atendedfully outl therefrom asis indicated t0 advantage. in `Figures Iy and 3. It will1 be -s'eenthat the'y structure is strong and durable, inerpensive tomanufacture, easy'to manipulate, Vand thoroughly efcient and'reliable.'4

Thepresentv embodiment 'oftheinvention7 y however, hasfb'een disclosed in considerable detail merely for thepurposes of exemplifica- 'tion'sinceinactual practice it attains the fea'- 'turesV ofj advantage enumerated as desirable vfin' the statement of the invention andthe "abovey description. f

Y `It will be apparent that changes in the details of construction, and vin the kcombination and arrangement of parts maybe resorted toVA without departing from the' spirit or scope te J of the invention as hereinafter claimedl or L sacrificing any of its advantages.

I claim as new is: i

1 An YeXtensible plank ofA the class de- Having thus described'my invention, what V e scribed including a central body portion and v; ,f a vpair offend portions telescopically associatedV therewith, said body portion including u a vplurality of 'spaced parallelfcoextensive bars and said end portions including a plu-` rality' of spaced coeXtensive parallel .barsr e slidablek between ,the first mentioned bars,` channel members across the ends of the first;

mentioned bars and having openings to receive the second mentioned bars. f 2. An extensible plank of the` class described including a central body portion and a pair of end portions telescopically associated therewith, said body portion including a 1plurality of spaced parallel coextensive bars and said end portions including a plurality of spaced coextensive parallel bars slidable m between the lirst mentioned bars, channel members across the ends of the first mentioned bars and having openings to receive the second mentioned bars, a U-shaped channel guard about the side ones of the second 1;, mentioned bars and extending along their outer ends. u l

An extensible plank of the class described including a central body portion and a pair of end portions telescopically associ- 2U ated therewith, said body portion including a plurality of spaced parallel coextensivc bars and said end portions including a lurality of spaced coextensive parallel bars slidable between the lirst mentioned bars, 2;, channel members across the ends of the first mentioned bars and having openings to receive the second mentioned bars, a U-shaped channel guard about the side ones of the second mentioned bars and extending along 3e their outer ends, spacer blocks between the outer ends of the second mentioned bars.

4. An extensible plank of the class described including a central body portion and a pair of end portions telescopically associ- 2:. ated therewith, said body portion including a plurality of spaced parallel coextensive bars and said end portions including a plurality of spaced coextensive parallel bars slidable between the first mentioned bars, 4o channel members across the ends of the iirst mentioned bars and having openings to receive the second mentioned bars, a U-shaped channel guard about the side ones of the second mentioned bars and extending along -15 their outer ends, spacer blocks between the outer ends of the second mentioned bars, plates secured above and below the first mentioned bars.

In testimony whereof I affix my signature.

5o CHAUNCY HAR-DING. 

